product name:recessed hex bolts color:white,black,bright zinc plated,and so on material: stainless steel,iron,and ... , SS410, SS420 2,Steel:C45(K1045), C46(K1046),C20 3.Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200CuZn37), ... SCM435,10B21Specification& gaugeM0.8-M10 Surface FinishingZn- Plated,Ni-plated,Passivated,Tin-plated,Sandblast and Anodize,Chromate, Polish,Electro Painting,Black ...